Depending upon which class your vest is, it can increase your likelihood to survive hits by most common self-defense handgun bullets, most knife strikes and be able to respond in self-defense.
If well fitted not uncomfortable, except holds in body heat.
Most vests (unless Class IV or better) are no help against hits from rifle bullets.
Might be seen as suspicious, hard to conceal under light clothing.
I stopped going to movies about 15 years ago. Between the price of ticket, sticky floors, inconsiderate patrons who talk and kick your seat, and my bad hearing; it is not worth it to me.
I rent it, watch on Blu-ray and have subtitles so I get all the dialog.
NRA Life Member - Orange Gunsite Member - NRA Certified Pistol Instructor
"When plunder becomes a way of life for a group of men living together in society,
they create for themselves in the course of time a legal system that authorizes it and a moral code that justifies it." Frederic Bastiat